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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 import 'dart:math' as math; | 5 import 'dart:math' as math; |
6 import 'dart:sky' as sky; | 6 import 'dart:sky' as sky; |
7 | 7 |
8 import '../framework/animation/generators.dart'; | 8 import '../framework/animation/generators.dart'; |
9 import '../framework/animation/mechanics.dart'; | 9 import '../framework/animation/mechanics.dart'; |
10 import '../framework/animation/scroll_behavior.dart'; | 10 import '../framework/animation/scroll_behavior.dart'; |
11 import '../theme2/edges.dart'; | 11 import '../theme2/edges.dart'; |
12 import '../theme2/view_configuration.dart' as config; | 12 import '../theme2/view_configuration.dart' as config; |
13 import 'basic.dart'; | 13 import 'basic.dart'; |
14 import 'material.dart'; | 14 import 'material.dart'; |
15 | 15 |
16 const double _kMillisecondsPerSecond = 1000.0; | 16 const double _kMillisecondsPerSecond = 1000.0; |
17 | 17 |
18 double _velocityForFlingGesture(sky.GestureEvent event) { | 18 double _velocityForFlingGesture(sky.GestureEvent event) { |
19 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, | 19 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, |
20 -event.velocityY)) / _kMillisecondsPerSecond; | 20 -event.velocityY)) / _kMillisecondsPerSecond; |
21 } | 21 } |
22 | 22 |
23 abstract class ScrollClient { | 23 abstract class ScrollClient { |
24 bool ancestorScrolled(Scrollable ancestor); | 24 bool ancestorScrolled(Scrollable ancestor); |
25 } | 25 } |
26 | 26 |
27 abstract class Scrollable extends Component { | 27 abstract class Scrollable extends Component { |
28 | 28 |
29 Scrollable({ Object key, Color this.backgroundColor }) : super(key: key, state
ful: true); | 29 Scrollable({ String key, Color this.backgroundColor }) |
| 30 : super(key: key, stateful: true); |
30 | 31 |
31 Color backgroundColor; | 32 Color backgroundColor; |
32 | 33 |
33 void syncFields(Scrollable source) { | 34 void syncFields(Scrollable source) { |
34 backgroundColor = source.backgroundColor; | 35 backgroundColor = source.backgroundColor; |
35 } | 36 } |
36 | 37 |
37 double _scrollOffset = 0.0; | 38 double _scrollOffset = 0.0; |
38 double get scrollOffset => _scrollOffset; | 39 double get scrollOffset => _scrollOffset; |
39 | 40 |
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154 | 155 |
155 void _handleFlingCancel(sky.GestureEvent event) { | 156 void _handleFlingCancel(sky.GestureEvent event) { |
156 _startSimulation(_createParticle()); | 157 _startSimulation(_createParticle()); |
157 } | 158 } |
158 | 159 |
159 void _handleWheel(sky.WheelEvent event) { | 160 void _handleWheel(sky.WheelEvent event) { |
160 scrollBy(-event.offsetY); | 161 scrollBy(-event.offsetY); |
161 } | 162 } |
162 | 163 |
163 } | 164 } |
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